True Genius Grecian Computer Wooden Math Puzzle

A dial-turning math brainteaser puzzle inspired by the astronomical computers of ancient Greece — rotate the layered dials until all 12 columns add up to 42. One of the hardest and best-selling puzzles in the True Genius collection.

The rules take five seconds; the solve can take weeks. Stacked rotating dials create thousands of possible alignments, and only the right combination makes every column total 42 — a challenge worthy of the Grecian astronomers who inspired it. The flat, medallion-like design looks like an artifact on a desk, which is exactly where it tends to live between attempts.

Rotating-dial math puzzle — align all 12 columns to sum to 42

Approx. 5.9" x 5.9" x 1.1" 4

Part of the True Genius collection of history-inspired brainteasers.

Project Genius creates premium brain teasers and logic puzzles that challenge the mind and inspire curiosity. Rooted in timeless design and educational value, their puzzles bring hands-on problem-solving to thinkers of all ages.